﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NGUYENTHUTRANG.Test.Test_1.ex1
{
   public abstract class GeometricObject 
    {
        abstract public double Area(Object obj);
        abstract public double Perrimetter(Object obj);
     
    }
}

